vandegeift



(No Model.)

P. ARMSTRONG & IN'. W. VANDEGRIFT.

' 'PIPE WRENCH.

No. 291,267. Patented Jan. 1, 1884.

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UNrTnn STATES PATENT @tarea FRANK ARMSTRONG AND i NATHANIEL w. VANDRGRIFT, or RRIDGRPORT, CONNECTICUT, SAID VANDEGRIFTASSIGNOR TO SAID ARMSTRONG..

PIPE-WRENCH.

SPECIFICATION forming part of Letters Patent No. 291,267, dated January 1, 1884. Application filed .Tune 21, 1883. (No model.)

To .all whom, t may concern,.-

Beit known that we, FRANK ARMsTRONG and NATHANIEL W. VANDRGRIFT, citizens of the United States, residing at Bridgeport, Faireld county, Connecticut, have invented new and useful Improvements in Pipe-Wrenches, of which the following is a specication.

Our invention relates to certain new and useful improvements in pipe-wrenches, and particularly to that type in which one of the jaws is made loosely connected with the other, or made movable for a slight distance when power is applied to the handle of the wrench to turn the pipe in such manner that the lower jaw is forced more tightly upon the pipe to take aiirmer hold, according to the necessary power to be applied to turn the pipe, as fully described in another application prepared and executed by us and filed of even date herewith.

The object of our present invention is to apply the power necessary to yoperate the lower movable jaw through the medium of a togglelever; and with this object in view our invention consists in the details of construction hereinafter described and claime In order that those skilled may know how to make and use our invention, we will describe the construction and operation of the same, referring by letters to the accompanying drawings, in which- Figure l is aside elevation of a wrench embodying our invention. Fig. 2 is a plan view, and Fig. 3 a longitudinal section taken at the line y y of Fig. 2.

Similar letters indicate like parts in the several figures.

The general features of construction are substantially like the Same parts shown and described in the other application hereinbefore referred to, and we will in this application simply designate them by letters of reference, but describing vwith particularity the cona struction and operations of the parts which diifer from the application referred to.

A represents the frame for securin g the jaws in operative positions.

B represents the upper jaw, with a shank, J.

E represents the lower jaw,with a shank, L.

C is the nut which operates the upper jaw 5o in its adjustments.

D is the handle-casting, into the end of which is secured the handle F. The casting D has secured to it a iiat spring, G, and H represents a pipe being operated upon.

The lowerjaw, B, unlike that described in the other application hereinbefore referred to, is not pivoted at its front end, but is recessed, as seenat a, and a pin, b, passing through the case A, serves to hold the jaw against accidental withdrawal, while it allows a free reciprocation of the same in proportion to the length of the recess.

The back end of the shank L has a transverse curved recess of more than a half-circle, adapted to receive one end of a solid link or toggle-arm, I, the other rounded end of which vseats itself in a suitable depression, c, in the lower back end of the case A, the length of the toggle-arm bearing suchl relation to its seats in the shank and frame that when in position it shall have an incline, as shown at Fig. 3, against which the nose J, at the front end of the casting D will impinge, so that a downward pressure of the handle will cause a pressure of said nose upon the toggle-arm I, and thus force the jaw E longitudinally toward the pipe H, the downwardly-projecting curved portion d of the handle-casting D serving'as a check or stop to prevent too great a 'movement of the handle, and, in addition to this means of stopping the' crushing effect of too great a movement of the handle, the nose J is rounded and otherwise shaped as best seen at Fig. 3, so that the upper surface of said nose will come in Contact with the partition in the case A between the recesses provided for the Shanks of the upper and lower Jaws.

It will be seen that the lower jaw, E, may be readily removed by simply withdrawing the securing-pin b for the purpose of substi tuting anew one or one ofdiffereut proportions, if necessary, and that the jaw E or a substitute may be placed in position bypassing the same into the recess in the case A in the direction indicated by the arrow at Fig. 3. The link or toggle-arm I, being seated within the end of the shank by passin it in transversely, against displacement by reason of the seat being more than a half-circle.

7We do not wish, of course, to confine ourselves in thc formation of the handle-socket D to casting the same, it may of course be made in any other suitable inanner; or the portion I) and handle proper may be inade in one piece. We have shown it. as made in two simply as a convenience for transportation or packing.

All inatter shown and described in this application which forms the subject-matter of claims in lthe other application hereinbefore referred to is hereby disclailned in this one.

That we claiin as new, and desire to secure by' Letters Patent, is-

l. In a pipe-wrench of the type herein shown, the lower jaw, E, provided with a shank, L, in combination with a toggle-arm, I, ease A, provided with a seat, c, and a handle-socket, D, provided with a nose or projecis held l tion', J, whereby the jaw .is oauscd to more outwardly in aI longitudinal. direction by the action of the nose J upon the inclined togglearni L as herciubefore set forth.

2. rlhe lower jaw, lil, provided with a rccess, a, in combination with the ease A, pin b, and ineans fornioring said ljaw longitudinally, as hereinbei'ore set forth.

The case A, adapted to receive in opera tive relation the moving; parts o1" the wrench, and provided with a seat, c, for the reception of one end o1" the toggle-arm l, substantially as shown and described.

In testimony whereot we have hereunto set our hands in the presence of two subscribing` witnesses.

FRANK ARMSTRONG.

NATHANXEL W'. VAXDEGRIFT.

Witnessesz F. B., Kerri',

H. E. Bowsnn. 

